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use futures::task::*;
use std;
use std::io::Read;
use std::io::Write;
use std::net::SocketAddr;
use std::pin::Pin;
use std::process::{Command, Stdio};
use tokio;
use tokio::io::ReadBuf;
use tokio::net::TcpStream;
pub enum Stream {
#[allow(missing_docs)]
Child(std::process::Child),
#[allow(missing_docs)]
Tcp(TcpStream),
}
impl Stream {
pub async fn tcp_connect(addr: &SocketAddr) -> Result<Stream, std::io::Error> {
Ok(Stream::Tcp(tokio::net::TcpStream::connect(addr).await?))
}
pub async fn proxy_command(cmd: &str, args: &[&str]) -> Result<Stream, std::io::Error> {
Ok(Stream::Child(
Command::new(cmd)
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.args(args)
.spawn()
.unwrap(),
))
}
}
impl tokio::io::AsyncRead for Stream {
fn poll_read(
mut self: Pin<&mut Self>,
cx: &mut Context,
buf: &mut ReadBuf,
) -> Poll<Result<(), std::io::Error>> {
match *self {
Stream::Child(ref mut c) => {
match c.stdout.as_mut().unwrap().read(buf.initialize_unfilled()) {
Ok(n) => {
buf.advance(n);
Poll::Ready(Ok(()))
}
Err(e) => Poll::Ready(Err(e)),
}
}
Stream::Tcp(ref mut t) => Pin::new(t).poll_read(cx, buf),
}
}
}
impl tokio::io::AsyncWrite for Stream {
fn poll_write(
mut self: Pin<&mut Self>,
cx: &mut Context,
buf: &[u8],
) -> Poll<Result<usize, std::io::Error>> {
match *self {
Stream::Child(ref mut c) => match c.stdin.as_mut().unwrap().write(buf) {
Ok(n) => Poll::Ready(Ok(n)),
Err(ref e) if e.kind() == std::io::ErrorKind::WouldBlock => Poll::Pending,
Err(e) => Poll::Ready(Err(e)),
},
Stream::Tcp(ref mut t) => Pin::new(t).poll_write(cx, buf),
}
}
fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Result<(), std::io::Error>> {
match *self {
Stream::Child(ref mut c) => match c.stdin.as_mut().unwrap().flush() {
Ok(_) => Poll::Ready(Ok(())),
Err(ref e) if e.kind() == std::io::ErrorKind::WouldBlock => Poll::Pending,
Err(e) => Poll::Ready(Err(e)),
},
Stream::Tcp(ref mut t) => Pin::new(t).poll_flush(cx),
}
}
fn poll_shutdown(
mut self: Pin<&mut Self>,
cx: &mut Context,
) -> Poll<Result<(), std::io::Error>> {
match *self {
Stream::Child(ref mut c) => {
c.stdin.take();
Poll::Ready(Ok(()))
}
Stream::Tcp(ref mut t) => Pin::new(t).poll_shutdown(cx),
}
}
}